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Mitutoyo 293-240-30 Digimatic Micrometer
The Mitutoyo 293-240-30 (MDC-25PX) is a premier 0–25 mm (0–1 inch) Digimatic outside micrometer featuring certified IP65 coolant-proof protection and micro-lapped carbide-tipped measuring faces. Delivering 0.001 mm (0.00005 in) digital resolution, an instrument accuracy of $\pm 1\,\mu\text{m}$, and an absolute electromagnetic induction linear encoder, it provides workshop-grade metrology precision directly in hostile CNC machining environments.
Features & Benefits
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Certified IP65 Coolant-Proof Protection: High-integrity elastomer sealing protects against heavy coolant splashing, cutting oil mist, and dust ingress during active machine shop use.
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Patented ABSOLUTE Linear Encoder: Eliminates the need to re-zero the tool on power-up and eliminates spindle overspeed tracking errors.
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Carbide-Tipped Measuring Faces: Micro-lapped carbide contact surfaces provide flat, parallel alignment with exceptional abrasion resistance against hardened alloys.
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0.001 mm / 0.00005 in Resolution: High-resolution digital display delivers an instrumental accuracy of $\pm 1\,\mu\text{m}$ for stringent tolerance verification.
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Thermal Insulating Frame Plates: Plastic frame shield prevents hand heat transfer from expanding the steel frame and distorting delicate measurements.
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Ratchet Stop Mechanism: Provides a constant, repeatable measuring force ($5\text{ to }10\text{ N}$) on workpieces, eliminating operator feel discrepancies.
Description
Regarded across precision manufacturing and quality control departments as the gold standard in handheld dimensional inspection, the Mitutoyo 293-240-30 combines sub-micron measurement accuracy with rugged factory-floor protection. Certified to IP65 international standards, the device is engineered with oil- and coolant-resistant materials across all critical seals, allowing machinists to measure freshly milled or turned workpieces dripping with cutting oil, coolant spray, and swarf without risking internal encoder contamination or tracking errors.
Specifications
| Specification Attribute | Details / Values |
| Brand / Manufacturer |
Mitutoyo Corporation |
| Model / MPN |
293-240-30 (MDC-25PX) |
| Product Series |
Series 293 Coolant Proof Digimatic Micrometers |
| Product Category |
Handheld Electronic Outside Micrometer |
| Measuring Range |
0 to 25 mm / 0 to 1 inch |
| Digital Resolution | 0.001 mm / 0.00005 in |
| Instrumental Accuracy | $\pm 1\,\mu\text{m}$ ($\pm 0.00005\text{ in}$, excluding quantizing error) |
| Flatness & Parallelism | Flatness: $0.3\,\mu\text{m}$ ($0.000012\text{ in}$); Parallelism: $1\,\mu\text{m}$ ($0.00004\text{ in}$) |
| Measuring Faces | Carbide-tipped, micro-lapped finish ($\varnothing 6.35\text{ mm}$) |
| Measuring Force | 5 to 10 N (Controlled via ratchet stop mechanism) |
| Protection Rating | IP65 (IEC 60529 dust-tight and water/oil jet resistant) |
| Encoder / Scale Type | ABSOLUTE Electromagnetic Induction Linear Encoder |
| Display | High-contrast multi-segment digital LCD screen |
| Functions | Origin-Set, Zero-Setting (INC mode), Auto Power ON/OFF, Low Voltage Alarm |
| Data Output Port | None (Dedicated standalone non-SPC model) |
| Power Source & Battery Life | 1× SR44 silver-oxide button cell (Part No. 938882); Approx. 2.4 years under normal use |
| Frame Construction | Forged alloy steel with fitted thermal insulation cover plates |
| Net Weight | Approx. 270 g (0.60 lbs) |
| In The Box / Standard Accessories | Mitutoyo 293-240-30 Micrometer, SR44 Battery, Spanner Wrench, Fitted Plastic Hard Case, Inspection Certificate, User Manual |
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